JPH037408B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to improvements in materials used in oil filters for vehicles, mainly laminated oil filters. As the speed of vehicle engines increases, the precision of engine parts improves, and filters for processing the oil that lubricates these parts are also required to have high precision. As an oil filter for the vehicle engine, paper is pleated and assembled into a chrysanthemum shape.
The so-called surface filtration method, in which oil is passed from the outside to the inside and sludge is captured by the paper surface, and the sludge is captured by passing oil through a layer of wood chips mixed with paper scraps, newspapers, magazines, cotton waste, etc. However, it is difficult to improve overaccuracy due to the shape and structure of the paper and material layers, so recently, as shown in Figure 1, it is difficult to improve the accuracy of the adapter A on the engine side. Inside the cylindrical container 1 attached via the cover plate 2, a large number of flat plate-like materials 3 are laminated, and end plates 4a, 4 are provided at the upper and lower ends.
A laminated type oil filter containing an over-element E tightened with a steel wire 5 along with the oil filter b is preferably used. The element of this filter is made of two fan-shaped parts 3a from a strip of paper as shown in Fig. 2A.
A hexagonal window hole 3c is provided in the center, and a hexagonal window hole 3c is provided in the center, and a hexagonal window hole 3c is provided in the overlapped portions on both sides of the fan-shaped portion 3a and in the strip portion 3b from the window hole 3c outward. Linear thin groove facing toward 3
d, or as shown in Figure B, three fan-shaped parts 3a are taken at equal intervals to form a trefoil shape, and a similar window hole 3c is provided in the center, and both sides of the fan-shaped parts 3a are cut out. A material with similar narrow grooves 3d formed in the overlapped portion is usually used, and such materials 3 are stacked with the angle shifted by 60 degrees,
For bilobed ones, every fourth leaf is in the same phase, and for trilobed ones, every third leaf is in the same phase.
Upper and lower fan-shaped portions 3a that are in the same phase and overlap
As a result, a fan-shaped space 6 is formed as shown in FIG. In use, inlet passage A ₁ of adapter A
The oil that entered container 1 from
It flows into the space 6 from around the , and flows out into the window hole 3c at the center while initially passing through the material wall at the center as indicated by the dotted line arrow. As time passes, sludge adheres to the surface of the material in the cavity 6 and a cake layer is formed, and as this cake layer is formed, the oil penetrates into the cake layer and the material on both sides of the cavity and becomes fine. The fine sludge present in the oil is captured by the cake layer and the material 3, and
The system is designed to purify the oil. By the way, the performance of a material changes significantly depending on its density. In other words, if the density of the material is high (the pores are small), the internal structure of the material will be clogged with sludge, and before a cake layer is formed, the pressure loss of the material will increase, resulting in a significant drop in flow rate and overworking. As a result, overefficiency decreases. On the other hand, if the density of the material is low (porosity is high), sludge will easily pass through the surface and inside of the material, making it difficult to form a cake layer.
In this case as well, the overefficiency is significantly reduced. The present invention was developed from this point of view, and aims to provide a material suitable for a laminated type oil filter that does not become clogged or reduce overefficiency even after long-term use. It has a flat plate shape and a density of 0.36g/cm ³ to 0.42g/cm ³ ,
It is characterized by a structure with a thickness of 0.7 mm to 1.3 mm and a pore diameter of 16 μm to 30 μm. By adopting the above-mentioned structure, the present invention prevents clogging inside the material due to sludge, and the life of the material is approximately twice as long as that of conventional general materials according to actual vehicle test results. The cake layer is produced well and the overefficiency can be improved by as much as two times. As mentioned above, the density of the material has an important effect on its performance, but if the density is less than 0.36 g/ ^cm3 , the resistance will be low and sludge will pass through easily, preventing the formation of a cake layer; ³ or higher, the resistance increases and the life of the element becomes shorter. Thickness affects narrow groove processing,
If the thickness is less than 0.7 mm, it will be difficult to groove the narrow grooves that should promote cake layering, and the number of punching steps for forming the material will increase;
If it is more than that, the number of laminated layers will decrease, and the excess area of the entire element will decrease, resulting in a decrease in performance. Furthermore, pore diameter is closely related to material density,
If it is less than 16 μm, oil will not flow well and clogging with sludge will occur, shortening the life of the element. If it is more than 30 μm, oil will flow better, but sludge will also pass through it, making it unable to function properly. Next, as shown in Table 1, in comparison with other similar materials, the material according to the present invention, which was obtained from a strip of paper as described above, was subjected to a bench test and an actual vehicle in terms of its overefficiency and oil flow rate. We will discuss the results of the test.

[Table] The bench test was conducted in accordance with the JIS standard (JISD1611-1976: Automotive oil filter performance test method). That is, a) Filter inlet pressure 3.0 Kgf/cm ² b Contaminant SOFTC-ZA c Contaminant addition amount 0.9 g/hour The amount of contaminant added was set to 0.9 g/hour based on the actual value of the engine bench test. d Test oil APICD grade The test oil is the API actually used in engines.
The lubricant is classified as CD class (lubricating oil for high-speed, high-load diesel engines) by the American Petroleum Institute (American Petroleum Institute). The reason for this is that CD grade oil has the highest content of detergent and dispersant, which disperses the aggregated carbon and ferric oxide contained in the contaminants and makes them fine particles, which generally lowers the overefficiency and makes the test more demanding. This is because it is appropriate for determining the quality of the material. e Amount of test oil 5.5 f Oil temperature of test oil 80°C Figure 3 A and B are graphical representations of the results of the above bench test, and according to these, sample A
Due to the high density of the material, within 10 hours after starting the test, the inside of the material became clogged with sludge, making it impossible for the test oil to flow through the material, resulting in no cake layer being formed on the surface of the material, significantly shortening the life of the material. It's summery.
On the other hand, since sample C has a low density, the oil flow rate decreases slowly over time, and the amount of sludge that passes through the material is large, the formation of a cake layer is slow, and the filter life is long.
Overefficiency is decreasing. On the other hand, for sample B ₂ , the oil flow rate decreased rapidly for 20 hours from the start of the test, but after that, the flow rate became almost constant and a cake layer was sufficiently formed on the material surface. The overefficiency is high, indicating that the density, thickness, and pore size of the material are overmatched. In addition, Sample B ₁ and Sample B ₃ show almost the same trends as Sample B ₂ , but Sample B ₁ has a higher overefficiency than Sample B ₂ but has a shorter material life;
Although the overefficiency of B ₃ is slightly lower than that of sample B ₂ , the life of the material is longer. Considering these matters, the lower limit of the density of the material is
0.36g/cm ³ , upper limit is 0.42g/cm ³ , lower limit of thickness is
0.7mm, upper limit is 1.3mm and lower limit of pore size is 16μ
m, and the upper limit was selected to be 30 μm. In addition, the results of an actual vehicle test as an evaluation of the actual use of the above samples A, B, and C (this evaluation is determined by the ratio of sludge (naphtha insoluble matter) contained in the engine oil depending on the mileage) are as follows. As shown in the graph of Figure 4, it can be seen that Sample B ₂ has a lower proportion of naphtha insolubles than Samples A and C and can sufficiently trap sludge. As described above, according to the present invention, a cake layer can be formed satisfactorily without causing clogging of the material, the life of the material can be extended, and overefficiency can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a laminated oil filter. Second
Figures A and B are plan views of commonly used materials.
Figure C is a perspective view showing a stacked state. Figure 3A is a graph showing the test results of overefficiency for samples. Figure B is a graph showing the test results for the oil flow rate. Figure 4 is a graph showing the results of the actual vehicle test. In the figure, 1...container, 2...cover plate, 3
...Material, 3a...Fan-shaped part, 3b...Band-shaped part, 3c...Window hole, 3d...Narrow groove, 4a, 4b
...End plate, A...Adapter.

Claims (1)

[Claims] 1 A material that is made of paper and has a flat plate shape, has a thin groove extending outward from a central window hole in the overlapped portion, and is laminated in large numbers at different angles, with a density of 0.36 g/cm ³ to 0.42 g/cm ³ , thickness 0.7mm to 1.3mm,
and a material for an oil filter characterized by having a pore diameter of 16 micrometers to 30 micrometers.